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   1 /*
   2  * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
   3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * H.264 / AVC / MPEG4 part10 codec.
  25  * non-MMX i386-specific optimizations for H.264
  26  * @author Michael Niedermayer <michaelni@gmx.at>
  27  */
  28
  29 #ifndef AVCODEC_X86_H264_I386_H
  30 #define AVCODEC_X86_H264_I386_H
  31
  32 #include <stddef.h>
  33
  34 #include "libavcodec/cabac.h"
  35 #include "cabac.h"
  36
  37 #if HAVE_INLINE_ASM
  38
  39 //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
  40 //as that would make optimization work hard)
  41 #if HAVE_7REGS
  42 #define decode_significance decode_significance_x86
  43 static int decode_significance_x86(CABACContext *c, int max_coeff,
  44                                    uint8_t *significant_coeff_ctx_base,
  45                                    int *index, x86_reg last_off){
  46     void *end= significant_coeff_ctx_base + max_coeff - 1;
  47     int minusstart= -(intptr_t)significant_coeff_ctx_base;
  48     int minusindex= 4-(intptr_t)index;
  49     int bit;
  50     x86_reg coeff_count;
  51
  52 #ifdef BROKEN_RELOCATIONS
  53     void *tables;
  54
  55     __asm__ volatile(
  56         "lea   "MANGLE(ff_h264_cabac_tables)", %0      \n\t"
  57         : "=&r"(tables)
  58     );
  59 #endif
  60
  61     __asm__ volatile(
  62         "3:                                     \n\t"
  63
  64         BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
  65                              "%5", "%q5", "%k0", "%b0",
  66                              "%c11(%6)", "%c12(%6)",
  67                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
  68                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
  69                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
  70                              "%13")
  71
  72         "test $1, %4                            \n\t"
  73         " jz 4f                                 \n\t"
  74         "add  %10, %1                           \n\t"
  75
  76         BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
  77                              "%5", "%q5", "%k0", "%b0",
  78                              "%c11(%6)", "%c12(%6)",
  79                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
  80                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
  81                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
  82                              "%13")
  83
  84         "sub  %10, %1                           \n\t"
  85         "mov  %2, %0                            \n\t"
  86         "movl %7, %%ecx                         \n\t"
  87         "add  %1, %%"REG_c"                     \n\t"
  88         "movl %%ecx, (%0)                       \n\t"
  89
  90         "test $1, %4                            \n\t"
  91         " jnz 5f                                \n\t"
  92
  93         "add"OPSIZE"  $4, %2                    \n\t"
  94
  95         "4:                                     \n\t"
  96         "add  $1, %1                            \n\t"
  97         "cmp  %8, %1                            \n\t"
  98         " jb 3b                                 \n\t"
  99         "mov  %2, %0                            \n\t"
 100         "movl %7, %%ecx                         \n\t"
 101         "add  %1, %%"REG_c"                     \n\t"
 102         "movl %%ecx, (%0)                       \n\t"
 103         "5:                                     \n\t"
 104         "add  %9, %k0                           \n\t"
 105         "shr $2, %k0                            \n\t"
 106         : "=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
 107           "+&r"(c->low), "=&r"(bit), "+&r"(c->range)
 108         : "r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
 109           "i"(offsetof(CABACContext, bytestream)),
 110           "i"(offsetof(CABACContext, bytestream_end))
 111           TABLES_ARG
 112         : "%"REG_c, "memory"
 113     );
 114     return coeff_count;
 115 }
 116
 117 #define decode_significance_8x8 decode_significance_8x8_x86
 118 static int decode_significance_8x8_x86(CABACContext *c,
 119                                        uint8_t *significant_coeff_ctx_base,
 120                                        int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){
 121     int minusindex= 4-(intptr_t)index;
 122     int bit;
 123     x86_reg coeff_count;
 124     x86_reg last=0;
 125     x86_reg state;
 126
 127 #ifdef BROKEN_RELOCATIONS
 128     void *tables;
 129
 130     __asm__ volatile(
 131         "lea    "MANGLE(ff_h264_cabac_tables)", %0      \n\t"
 132         : "=&r"(tables)
 133     );
 134 #endif
 135
 136     __asm__ volatile(
 137         "mov %1, %6                             \n\t"
 138         "3:                                     \n\t"
 139
 140         "mov %10, %0                            \n\t"
 141         "movzbl (%0, %6), %k6                   \n\t"
 142         "add %9, %6                             \n\t"
 143
 144         BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
 145                              "%5", "%q5", "%k0", "%b0",
 146                              "%c12(%7)", "%c13(%7)",
 147                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
 148                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
 149                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
 150                              "%15")
 151
 152         "mov %1, %k6                            \n\t"
 153         "test $1, %4                            \n\t"
 154         " jz 4f                                 \n\t"
 155
 156 #ifdef BROKEN_RELOCATIONS
 157         "movzbl %c14(%15, %q6), %k6\n\t"
 158 #else
 159         "movzbl "MANGLE(ff_h264_cabac_tables)"+%c14(%k6), %k6\n\t"
 160 #endif
 161         "add %11, %6                            \n\t"
 162
 163         BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
 164                              "%5", "%q5", "%k0", "%b0",
 165                              "%c12(%7)", "%c13(%7)",
 166                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
 167                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
 168                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
 169                              "%15")
 170
 171         "mov %2, %0                             \n\t"
 172         "mov %1, %k6                            \n\t"
 173         "movl %k6, (%0)                         \n\t"
 174
 175         "test $1, %4                            \n\t"
 176         " jnz 5f                                \n\t"
 177
 178         "add"OPSIZE"  $4, %2                    \n\t"
 179
 180         "4:                                     \n\t"
 181         "addl $1, %k6                           \n\t"
 182         "mov %k6, %1                            \n\t"
 183         "cmpl $63, %k6                          \n\t"
 184         " jb 3b                                 \n\t"
 185         "mov %2, %0                             \n\t"
 186         "movl %k6, (%0)                         \n\t"
 187         "5:                                     \n\t"
 188         "addl %8, %k0                           \n\t"
 189         "shr $2, %k0                            \n\t"
 190         : "=&q"(coeff_count), "+m"(last), "+m"(index), "+&r"(c->low),
 191           "=&r"(bit), "+&r"(c->range), "=&r"(state)
 192         : "r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base),
 193           "m"(sig_off), "m"(last_coeff_ctx_base),
 194           "i"(offsetof(CABACContext, bytestream)),
 195           "i"(offsetof(CABACContext, bytestream_end)),
 196           "i"(H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET) TABLES_ARG
 197         : "%"REG_c, "memory"
 198     );
 199     return coeff_count;
 200 }
 201 #endif /* HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
 202
 203 #endif /* HAVE_INLINE_ASM */
 204 #endif /* AVCODEC_X86_H264_I386_H */